Goodwill and Other Intangible Assets (Schedule of changes in the carrying amount of goodwill) (Details) - USD ($) $ in Millions	12 Months Ended
	May 28, 2017	May 29, 2016	May 31, 2015
Goodwill [Line Items]
Beginning balance	$ 8,741.2	$ 8,874.9	$ 8,650.5
Acquisitions		83.5	589.8
Divestitures	(2.3)	(186.4)
Other activity, primarily foreign currency translation	8.3	(30.8)	(365.4)
Ending balance	8,747.2	8,741.2	8,874.9
North America Retail [Member]
Goodwill [Line Items]
Beginning balance	6,410.3	6,546.2	5,975.1
Acquisitions		54.1	589.8
Divestitures	0.0	(184.5)
Other activity, primarily foreign currency translation	(3.8)	(5.5)	(18.7)
Ending balance	6,406.5	6,410.3	6,546.2
Convenience Stores and Foodservice [Member]
Goodwill [Line Items]
Beginning balance	921.1	921.1	921.1
Acquisitions		0.0	0.0
Divestitures	(2.3)	0.0
Other activity, primarily foreign currency translation	0.0	0.0	0.0
Ending balance	918.8	921.1	921.1
Europe and Australia [Member]
Goodwill [Line Items]
Beginning balance	716.5	719.1	866.1
Acquisitions		0.0	0.0
Divestitures	0.0	0.0
Other activity, primarily foreign currency translation	(15.7)	(2.6)	(147.0)
Ending balance	700.8	716.5	719.1
Asia and Latin America [Member]
Goodwill [Line Items]
Beginning balance	287.1	287.0	390.0
Acquisitions		29.4	0.0
Divestitures	0.0	(1.9)
Other activity, primarily foreign currency translation	25.3	(27.4)	(103.0)
Ending balance	312.4	287.1	287.0
Joint Ventures [Member]
Goodwill [Line Items]
Beginning balance	406.2	401.5	498.2
Acquisitions		0.0	0.0
Divestitures	0.0	0.0
Other activity, primarily foreign currency translation	2.5	4.7	(96.7)
Ending balance	$ 408.7	$ 406.2	$ 401.5